Vaporeon @ Normalium Z  
Ability: Water Absorb  
EVs: 12 HP / 252 SpA / 244 Spe  
Timid Nature  
IVs: 0 Atk  
- Celebrate  
- Ice Beam  
- Hydro Pump  
- Shadow Ball  

Vikavolt-Totem @ Metronome  
Ability: Levitate  
EVs: 192 HP / 136 SpA / 180 Spe  
Modest Nature  
IVs: 0 Atk  
- Energy Ball
- Volt Switch  
- Bug Buzz  
- Roost  

Rhydon @ Eviolite  
Ability: Lightning Rod  
EVs: 228 HP / 76 Atk / 36 Def / 4 SpD / 164 Spe  
Adamant Nature  
- Stealth Rock  
- Fire Punch  
- Rock Blast  
- Earthquake  

Passimian @ Choice Scarf  
Ability: Receiver  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Close Combat  
- U-turn  
- Knock Off  
- Gunk Shot  

Silvally-Steel @ Steel Memory  
Ability: RKS System  
EVs: 232 HP / 216 SpD / 60 Spe  
Calm Nature  
- Toxic  
- Flamethrower  
- U-turn  
- Defog  

Delphox @ Leftovers  
Ability: Blaze  
EVs: 248 HP / 68 SpA / 192 Spe  
Timid Nature  
IVs: 0 Atk  
- Protect  
- Substitute  
- Mystical Fire  
- Toxic  

HP Grass can be ran over Shadow Ball on Vaporeon to bop Seismitoad harder so you can run Thunderbolt on Vika instead. Metronome Vika is hella fun. Also, Rhydon EVs allow it to tank a Grass Knot from Xatu (which already does with investment). Attack EVs 2HKO Ferroseed with Fire Punch.